Sea level rise is among the most visible consequences of global warming, but for some countries, it is an imminent existential threat. World leaders approved a new declaration on Thursday while debating the best ways to strengthen international cooperation and support vulnerable low-lying nations most at risk.

“We are the first generation with the tools to end the fossil fuel age – and the last who can avert climate catastrophe,” UN Secretary-General António Guterres said on Wednesday, calling on countries to draw up credible roadmaps with clear timelines to transition away from fossil fuels.

From deadly floods in the Himalayas to wildfires and extreme heat across Europe, 2026 has brought a succession of stark reminders of a changing climate. The task is immediate: Protect people from the impacts already unfolding while rapidly cutting the emissions of harmful gasses driving climate change. World leaders have been meeting on Wednesday to discuss how to turn those priorities into action.